The Germans introduced the Sturmgewehr 44 (7.92 x 33 Kurz caliber) in the latter part of WWII, Tom. It was based on the previously developed Maschinenpistole MP 43. Hitler initially opposed the development of the rifle, but the military continued development of it secretly. It is considered the precursor to all other assault rifles and heavily influenced the development of the later Russian AK47. Like so many excellent German weapons designs, it was too little, too late. By the time it was introduced, Germany was unable to manufacture it in sufficient quantity for it to make much of a difference.

I'm sure there are some, certainly a few in museums. They were never legal here in the US and sold as surplus because of the full automatic capability. Ammo for them would be very difficult to obtain today.

I have seen them still being used about 30 years ago by some African countries. Soon replaced by AKs.

And you know Charlie, is it a sad end? The alternative is being turned into scrap, they are obsolete after all. Through de activation they can remain in the hands of collectors who will enjoy and appreciate them for many years.